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Bump version to 1.5.4.1 #178

Job	Run time
Ruff (lint + format)	22s
Build wheel, install & CLI smoke test	21s
Pyright	28s
pip-audit (dependency CVEs)	16s
Tests (py3.11)	1m 7s
Tests (py3.12)	1m 11s
Tests (py3.13)	1m 9s
	4m 54s